<template>
  <!--    <div class="test"-->
  <!--         style="display: flex; width:1500px; height: 600px; border: 1px solid #ccc;-->
  <!--         flex-wrap: nowrap; justify-content: space-around; align-items: center;">-->
  <!--      <div style=" width: 50px; height: 50px; margin: 5px; background-color: red;"></div>-->
  <!--      <div style=" flex: 1; height: 50px;  margin: 5px; background-color: yellowgreen;"></div>-->
  <!--      <div style="  flex: 5; height: 50px;  margin: 5px; background-color: yellowgreen;"></div>-->
  <!--      <div style=" width: 50px; height: 50px; margin: 5px; background-color: red;"></div>-->
  <!--    </div>-->
  <div style="display: flex; justify-content: flex-start; position: relative;">
    <div class="arrow" @click="toLeft"><i class="el-icon-arrow-left"/></div>
    <div id="tags-view-container_id" ref="scrollContainer" class="tags-view-container"
         style="position: relative; overflow: hidden;">
      <div
          :style="{
        display: 'inline-block',
        position: 'absolute',
        left: paneleft+'px',
        whiteSpace: 'nowrap',
        backgroundColor: 'green',
        }"
          ref="scrollPane" class="tags-view-wrapper" @scroll="handleScroll">
        <router-link
            v-for="tag in visitedViews"
            ref="tag"
            :key="tag.path"
            :class="isActive(tag)?'active':''"
            :to="{ path: tag.path, query: tag.query, fullPath: tag.fullPath }"
            tag="span"
            class="tags-view-item"
            @click.middle.native="!isAffix(tag)?closeSelectedTag(tag):''"
            @contextmenu.prevent.native="openMenu(tag,$event)"
        >
          {{ tag.name }}
          <span v-if="!isAffix(tag)" class="el-icon-close" @click.prevent.stop="closeSelectedTag(tag)"/>
        </router-link>
      </div>
    </div>
    <ul v-show="visible" :style="{left:left+'px',top:top+'px'}" class="contextmenu">
      <li @click="refreshSelectedTag(selectedTag)">Refresh</li>
      <li v-if="!isAffix(selectedTag)" @click="closeSelectedTag(selectedTag)">Close</li>
      <li @click="closeOthersTags">Close Others</li>
      <li @click="closeAllTags(selectedTag)">Close All</li>
    </ul>
    <div style="display: inline-block; overflow: hidden " class="arrow" @click="toRight"><i class="el-icon-arrow-right"/></div>
    <!--    <div style="display: inline-block; " class="arrow" @click="openMenu2()">&gt</div>-->

  </div>
</template>

<script>
import ScrollPane from './ScrollPane'
import path from 'path'

export default {
  components: {ScrollPane},
  data() {
    return {
      paneleft: 10,
      visible: false,
      top: 0,
      left: 0,
      selectedTag: {},
      affixTags: []
    }
  },
  computed: {
    visitedViews() {
      return this.$store.state.tagsView.visitedViews
    },
    routes() {
      return this.$store.state.permission.routes
    }
  },
  watch: {
    $route() {
      this.addTags()
      this.moveToCurrentTag()
    },
    visible(value) {
      if (value) {
        document.body.addEventListener('click', this.closeMenu)
      } else {
        document.body.removeEventListener('click', this.closeMenu)
      }
    }
  },
  mounted() {
    this.initTags()
    this.addTags()
  },
  methods: {
    isActive(route) {
      return route.path === this.$route.path
    },
    isAffix(tag) {
      return tag.meta && tag.meta.affix
    },
    filterAffixTags(routes, basePath = '/') {
      let tags = []
      routes.forEach(route => {
        if (route.meta && route.meta.affix) {
          const tagPath = path.resolve(basePath, route.path)
          tags.push({
            fullPath: tagPath,
            path: tagPath,
            name: route.name,
            meta: {...route.meta}
          })
        }
        if (route.children) {
          const tempTags = this.filterAffixTags(route.children, route.path)
          if (tempTags.length >= 1) {
            tags = [...tags, ...tempTags]
          }
        }
      })
      return tags
    },
    initTags() {
      const affixTags = this.affixTags = this.filterAffixTags(this.routes)
      for (const tag of affixTags) {
        // Must have tag name
        if (tag.name) {
          this.$store.dispatch('tagsView/addVisitedView', tag)
        }
      }
    },
    addTags() {
      const {name} = this.$route
      if (name) {
        this.$store.dispatch('tagsView/addView', this.$route)
      }
      return false
    },
    moveToTarget(currentTag) {
      let tagList = this.$refs.tag
      let pane = this.$refs.scrollPane
      let container = this.$refs.scrollContainer
      // find first tag and last tag
      let firstTag = null
      let lastTag = null
      if (tagList.length > 0) {
        firstTag = tagList[0]
        lastTag = tagList[tagList.length - 1]
      }
      const currentIndex = tagList.findIndex(item => item === currentTag)
      // const prevTag = tagList[currentIndex - 1]
      // const nextTag = tagList[currentIndex + 1]
      console.log(currentTag.$el.getBoundingClientRect())
      console.log(pane.getBoundingClientRect())
      console.log(container.getBoundingClientRect())
      let tagRect = currentTag.$el.getBoundingClientRect()
      let paneRect = pane.getBoundingClientRect()
      let containerRect = container.getBoundingClientRect()
      if(tagRect.left < containerRect.left){
        this.paneleft = paneRect.left - tagRect.left
      }else if(tagRect.right > containerRect.right){
        this.paneleft = (containerRect.width - tagRect.width) - (tagRect.left - paneRect.left)
      }




    },

    moveToTarget3(currentTag) {
      console.log('moveToTarget called')
      let tagList = this.$refs.tag
      let pane = this.$refs.scrollPane
      let container = this.$refs.scrollContainer
      // find first tag and last tag
      let firstTag = null
      let lastTag = null
      if (tagList.length > 0) {
        firstTag = tagList[0]
        lastTag = tagList[tagList.length - 1]
      }
      const currentIndex = tagList.findIndex(item => item === currentTag)
      let tagRect = currentTag.$el.getBoundingClientRect()
      let paneRect = pane.getBoundingClientRect()
      let containerRect = container.getBoundingClientRect()
      if(tagRect.left < containerRect.left){
        this.paneleft += 20
        this.$nextTick(()=>{
          this.moveToTarget(currentTag)
        })
      }else if(tagRect.right > containerRect.right){
        this.paneleft -= 20
        this.$nextTick(()=>{
          this.moveToTarget(currentTag)
        })

      }

    },
    moveToCurrentTag() {
      const tags = this.$refs.tag
      this.$nextTick(() => {
        for (const tag of tags) {
          if (tag.to.path === this.$route.path) {
            this.moveToTarget(tag)
            // when query is different then update
            //当path相同，但是query不同的时候，要更新store里存储的visitedView数组的相关tag的fullPath，这里并不是更新页面，只是更新某个tag的query信息
            if (tag.to.fullPath !== this.$route.fullPath) {
              this.$store.dispatch('tagsView/updateVisitedView', this.$route)
            }
            break
          }
        }
      })
    },
    moveToCurrentTag_bak() {
      const tags = this.$refs.tag
      this.$nextTick(() => {
        for (const tag of tags) {
          if (tag.to.path === this.$route.path) {
            this.$refs.scrollPane.moveToTarget(tag)
            // when query is different then update
            //当path相同，但是query不同的时候，要更新store里存储的visitedView数组的相关tag的fullPath，这里并不是更新页面，只是更新某个tag的query信息
            if (tag.to.fullPath !== this.$route.fullPath) {
              this.$store.dispatch('tagsView/updateVisitedView', this.$route)
            }
            break
          }
        }
      })
    },
    refreshSelectedTag(view) {
      this.$store.dispatch('tagsView/delCachedView', view).then(() => {
        const {fullPath} = view
        this.$nextTick(() => {
          this.$router.replace({
            path: '/redirect' + fullPath
          })
        })
      })
    },
    closeSelectedTag(view) {
      // console.log('closeSelected Tag')
      this.$store.dispatch('tagsView/delView', view).then(({visitedViews}) => {
        if (this.isActive(view)) {
          this.toLastView(visitedViews, view)
        }
      })
    },
    closeOthersTags() {
      this.$router.push(this.selectedTag)
      this.$store.dispatch('tagsView/delOthersViews', this.selectedTag).then(() => {
        this.moveToCurrentTag()
      })
    },
    closeAllTags(view) {
      this.$store.dispatch('tagsView/delAllViews').then(({visitedViews}) => {
        if (this.affixTags.some(tag => tag.path === view.path)) {
          return
        }
        this.toLastView(visitedViews, view)
      })
    },
    toLastView(visitedViews, view) {
      console.log('toLastView')
      if (visitedViews.length === 0) {
        this.$store.dispatch('tagsView/addView', {
          fullPath: '/ycgl/yckz',
          path: '/ycgl/yckz',
          name: '远程控制',
          meta: {title: '远程控制'}
        })
        this.$router.push('/ycgl/yckz')
        return
      }
      const latestView = visitedViews.slice(-1)[0]
      if (latestView) {
        this.$router.push(latestView.fullPath)
      } else {
        // now the default is to redirect to the home page if there is no tags-view,
        // you can adjust it according to your needs.
        if (view.name === 'Dashboard') {
          // to reload home page
          this.$router.replace({path: '/redirect' + view.fullPath})
        } else {

          this.$router.push('/ycgl/yckz')
        }
      }
    },
    openMenu(tag, e) {
      const menuMinWidth = 105
      const offsetLeft = this.$el.getBoundingClientRect().left // container margin left  本组件dom在视口左边的距离
      console.log('offsetLest==========' + offsetLeft)
      const offsetWidth = this.$el.offsetWidth // container width
      const maxLeft = offsetWidth - menuMinWidth // left boundary
      const left = e.clientX - offsetLeft + 15 // 15: margin right    e.clientX: 事件在视口的位置
      console.log('clientX==========' + e.clientX)

      if (left > maxLeft) {
        this.left = maxLeft
      } else {
        this.left = left

      }

      this.top = e.clientY - this.$el.getBoundingClientRect().top

      // this.left = 0
      // this.top = 0
      this.visible = true
      this.selectedTag = tag
    },
    closeMenu() {
      console.log('closemenu')
      this.visible = false
    },
    handleScroll() {
      this.closeMenu()
    },
    toLeft() {
      console.log('toLeft')

      this.paneleft -= 20
      this.$refs.scrollPane.style.left = this.paneleft + 'px'
      console.log(this.$refs.scrollPane.style.left)
      console.log('ooooo')
    },
    toRight() {
      console.log('toright')
      if (this.paneleft >= 20)
        return
      this.paneleft += 20
      this.$refs.scrollPane.style.left = this.paneleft + 'px'
      console.log(this.$refs.scrollPane.style.left)
      console.log('ooooo')
    },
    openMenu2() {
      console.log('openMenu2')
      this.left = 0
      this.top = 0
      this.visible = true
    }
  }
}
</script>

<style lang="scss" scoped>
.tags-view-container {
  //height: 60px;
  //width: 1300px;
  flex-grow: 1;
  background: #e6ebf5;
  //border-bottom: 2px solid #000000;
  //box-shadow: 0 1px 3px 0 rgba(0, 0, 0, .12), 0 0 3px 0 rgba(0, 0, 0, .04);
  .tags-view-wrapper {
    //height: 50px;
    //width: 95%;
    //overflow: auto;
    .tags-view-item {
      display: inline-block;
      //position: relative;
      cursor: pointer;
      height: 40px;
      line-height: 40px;
      border: 1px solid #d8dce5;
      color: #495060;
      background: #e6ebf5;
      padding: 0 8px;
      font-size: 12px;
      //margin-left: 5px;
      //margin-top: 4px;
      margin-bottom: 4px;

      &:first-of-type {
        //margin-left: 20px;
      }

      &:last-of-type {
        //margin-right: 15px;
      }

      &.active {
        background-color: #1482f0;
        color: #fff;
        border-color: #1482f0;
        //&::before {
        //  content: '';
        //  background: #fff;
        //  display: inline-block;
        //  width: 8px;
        //  height: 8px;
        //  border-radius: 50%;
        //  position: relative;
        //  margin-right: 2px;
        //}
      }
    }
  }


}

.contextmenu {
  margin: 0;
  background: #fff;
  z-index: 3000;
  position: absolute;
  list-style-type: none;
  padding: 5px 0;
  border-radius: 4px;
  font-size: 12px;
  font-weight: 400;
  color: #333;
  box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, .3);

  li {
    margin: 0;
    padding: 7px 16px;
    cursor: pointer;

    &:hover {
      background: #eee;
    }
  }
}
</style>

<style lang="scss">
//reset element css of el-icon-close
.tags-view-wrapper {
  .tags-view-item {
    .el-icon-close {
      width: 16px;
      height: 16px;
      vertical-align: 2px;
      border-radius: 50%;
      text-align: center;
      transition: all .3s cubic-bezier(.645, .045, .355, 1);
      transform-origin: 100% 50%;

      &:before {
        transform: scale(.6);
        display: inline-block;
        vertical-align: -3px;
      }

      &:hover {
        background-color: #b4bccc;
        color: #fff;
      }
    }
  }
}

.arrow {
  //margin-top: 4px;
  height: 40px;
  line-height: 40px;
  width: 20px;
  padding: 5px 0px;
  background: #e6ebf5;
  font: bold 20px/30px "宋体";

  &:hover {
    cursor: pointer;
    background-color: #1482f0;
    color: #fff;
    border-color: #1482f0;
  }
}
</style>
